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A member asked:
Had coffee at about 8+pm. tried to sleep at 12am but felt my heart race and is wide awake. can the effect of coffee comes on hours after i drank it?
A doctor has provided 1 answer
Yes, the: metabolism of caffeine is such that the half life is about four to six hours in normal individuals. By midnight you still had at least half of the caffeine active in your system. Other food or drink (for example grapefruit juice) could affect this and prolong the metabolism even more. Switch to decaff in the evening next time!
Answered 3/23/2017
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